When you are in Teaming and click on "Meet", it brings up a window where you invite people. There are two options to "Start Meeting Now" or "Schedule for Later". If you click on "Start Meeting Now", the Conferencing client starts and you have the meeting. When you end the meeting and the window that gives the "Start Meeting Now" and "Schedule for later" is still open, conferencing client crashes and freezes.
However, when you click "Start Meeting Now" and then say close, conferencing client launches and you can have the meeting. If you end the meeting, conference client shuts down normally.

This might be a parent process or something that causes this.